Stone-dressing tool



May 10, 1927.

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Patented May 10, 1927.

.UITED stares ETTORE BONAZZI, or MONTPELIER, vnnmoivr.

STONE-DRESSING TOOL.

Application filed February 13, 1925. Serial No. 10,039.

.This invention relates to an improved tool for dressing stones, the same being especially, although not necessarily, primarily intended for working down and finishing 01f comparatively rough parts of marble and granite to be used in the production of monuments and the like.

In order that a clear understanding of the invention may be had, it is deemed advisable to 'briefly' consider the manner of treating stones of this class; .To this end, it is to be stated that in the progress of manufacturing rough granite into monuments, the stones as they come from the quarries are squared 1 by means of discs and planed, or are sawed or. pointed with a surface cutter, in some instances the pointing being done by hand.

The second step, if the stone is to be hammered, is to have it hammered by a hand operated implement or hammeredunder a surface cutter. If the stone is to be polished,

it must be carried to a polishing mill, where the surface is moved down with an ironing wheel in which shot is used. Secondly, a thin scroll is frequently used with comound abrasive. Finally, to bring out a iigh polish, a bulfer is used, the entire method of polishing and hammering being performed on a smooth surface. 7

The foregoing method of treating stone, which is a'practice' which appears 'to'be uniform in most modern monumental work, is unduly lon and exceedingly expensive, requiring the skilled service of numerous employees.

After thoroughly explaining the difiiculties arising from the conditions specified, I have evolved and produced a means which enables practically the entire work enumerated to be done with approximately three tools, the fundamental principle of construction of which is the same in all instances.

III

The primary tool is of steel, the same be ing high adaptable for treating stone in the first stages. The second tool is an abrasive tool, the same serving to bring on a more plane surface, and the remaining tool is a buffer used for finishing the already smooth surface.

The invention not only has reference'to the improved tools for dressing the stone, but relates also to a novel purpose which is fol lowed to insure accomplishment of the most effective result" possible through the use of the improved tools.

Themethod referred to and the improved .into rotation itcconstitutes a cuttings off.

tools will be rendered more clear upon carefully consideringthe following description in connection with the accompanying drawing wherein s V Figure 1 is a side elevation of the primary steel tool employed in the initial operations uponthe stone, the generic principle of construction being here illustrated.

F igq2 is a detail view of one of the disks utilized in the construction of thetool shown inFig.1. P

Fig. 3 is a side elevationof the disk prior to reducing it I to the shape exhibited in 2. I s

Fig. 4 is a perspective of a spacing washer constituting apart of the 'improvedtool.

Fig. 5 is a side elevation of the washer before it is bent. I

Fig. 6 is a diagrammatic illustration showing the method of operation. I

Fig. 7 is a view,-'on reduced scale, like Fig. 1, showing an abrasive tool.

As before stated, the invention in its broadest aspect comprises the three tools specifically referred to, to be used in the manner enumerated and considered generically the principle of construction ofeach tool is precisely the same. i

In other words, the general principle upon which each tool'is made is that it is of spiral formation so that upon set-ting it cutting screw serving to smooth the surface and-carrythe" Attention is first confined to Fig. 1 wherein it will be seen that an appropriate shaft 7 1 is shown. Seated upon this shaft is a spiral hub. The hub in the present instance is made up of a plurality of individual spacing washers 2, shownin detail in Figs. 4 and 5. These washers are of bendable steel and in practice each washer, which is comparatively wide, is slit transversely as indicated at 3 in Fig. 5. The free ends 4 are then bent away from each other in opposite directions and the washers are somewhat contracted in circumference. The several Washers are placed in a series on the shaft 1 as clearly illustrated in Fig. 1 to form the hub which actually provides a spiral groove extending from end to end.

Located in this groove is a spiral cutter. lVhile the cutter could be constructed otherwise, it is preferably made of individual 9 steel disks 5 shown in detail in Figs. 2 and 3. The disks, like the washers, are slit on IOU one side as at 6, the slit extending through the peri ihery and permitting the adj aeent free ends to be twisted or bent away from each other as at T. The adjarent disks and washers 3 are arranged in abutting relation and the inner portions of the disks are confined in the spiral grooves provided between the washers 2.

llioth the disks and washers are lormed at )redeterinined points with keyways 51f tor the reception of a ke (not shown) carried by the shaft to securely anchor the snriliaring means of said shaft. Manifestly when deemed expedient the 'l'rictional contact between said key 8 and the shaft, disks and washers may be depended upon to hold the disks and washers in assembled relation. In assembling, a disk 5 is placed on the shaft,

then a washer 2, then another disk, another washer, and so on. The washers may vary in width to vary the spaces between the disks to permit a liner. or coarser shave of the stone surface.

Noting now the abrasive tool shown in Fig. 7, it will be seen that the disks 9 there shown are simply of abrasive material, the construction being the sameas that described for the steel disk 5. The spacing washers 2 are identical, being useable with either the steel or abrasive disks. The shaft 1 .the same. Hence, the same. reference characters used for these two parts.

Although it has not .been shown, the third tool, known as a butler, may be of the same construction except that the peripheries of the disks may be of felt or other equivalent material. Although the peripheries of the disks have been shown of particular configuration in the two instances illustrated, it is to be understood that the shape may be varied aecordlng to the grade of stone being acted on.

in use, the blocks of stoneS are moved by an appropriate table or the like (not shown) in the direction ol the straight arrows, Figure (3, while the shaft oi the cutter, which is driven by a suitable machine, is rotated in ihe direction of the curvilinear arrow. The movement ol the stone is in one direction and the rotation of the cutter is in an opposite ,lireelion. Not only this, but the cutter is disposed at a diagonal angle across the surface of the stone rather than at a true right angle. This facilitates the movement and ready enttingrand the smooth surjlaoing oi the same. r

It thought that the foregoing descrip tion taken in connection with the drawings, will enable :persons skilled in the art to which the invention relates to obtain a clear understanding of the same. For this reason, a more lengthy description is thought unnecessary.

W'hile the pretfcrrial embodiment of the invention has been shown and described, it is to be understood that minor changes C0111- ing within the field of invention claimed, may be resorted to if desired,

Having thusdescribed my iiwentiolnwhat I claim as new is A tool comprising a shaft, a plurality of spaced spiral disks about the shaft, Peach disk havinga central. opening anda slot rextending from said opening to its periphery, and the ends of the disk at opposite sides of the slot being spaced trom and disposed at opposite sides of the plane of the major portion of the disk, spiral split washers arranged about the shaft and between the disks, and means holding, the disks, andl washers to the shaft.

In testimony whereof I affix my signature.

n'rronn BONAZZI. 

